package com.snoob.springcloudalibaba.util;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.Hashtable;

/**
 * 二维码生成器
 * @author lixing
 * @date 2021/2/23 0023 下午 1:48:08
 * 依赖
 *     <dependency>
 *       <groupId>com.google.zxing</groupId>
 *       <artifactId>core</artifactId>
 *       <version>3.1.0</version>
 *     </dependency>
 *     <dependency>
 *       <groupId>com.google.zxing</groupId>
 *       <artifactId>javase</artifactId>
 *       <version>3.1.0</version>
 *     </dependency>
 *  案例
 *  @GetMapping("getProDetail/{proId}")
 *  void getProDetail(HttpServletResponse response, @PathVariable String proId) throws Exception {
 *     // 根据商品id查询商品图片
 *     String proPic = null;
 *     List<Map<String, Object>> mapList = prodPicService.getByProdId(Integer.parseInt(proId));
 *     if (mapList.size() > 0 ) {
 *     proPic = null != mapList.get(0).get("picPath") ? mapList.get(0).get("picPath").toString() : null;
 *     }
 *     // 商品详情页地址
 *     String proDetailUrl = MessageFormat.format("https://h5.laohugy.com/prodDetails?rid={0}", proId);
 *     //
 *     ServletOutputStream servletOutputStream = response.getOutputStream();
 *     QrCodeUtil.encode(proDetailUrl, proPic, servletOutputStream, true);
 *  }
 */
public class QrCodeUtil {
    private static final String CHARSET = "utf-8";
    private static final String FORMAT_NAME = "png";
    /** 二维码尺寸 */
    private static final int QRCODE_SIZE = 300;
    /** LOGO宽度 */
    private static final int WIDTH = 60;
    /** LOGO高度 */
    private static final int HEIGHT = 60;

    public static void main(String[] args) throws Exception {
        String logoPath = "D:"+File.separator+"logo.png";
        String destPath = "D:"+File.separator+"code.png";
        //
        OutputStream output = new FileOutputStream(destPath);
        QrCodeUtil.encode("https://h5.laohugy.com/#/prodDetails?rid=3501", logoPath, output, true);
    }

    /**
     * 生成二维码(内嵌LOGO)
     * @param content url地址  
     * @param imgPath LOGO地址  
     * @param output 输出流  
     * @param needCompress 是否压缩LOGO
     */
//    public static void encode2(String content, String imgPath, OutputStream output, boolean needCompress) throws Exception {
//        // 字节输出流
//        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
//        //
//        BufferedImage image = QrCodeUtil.createImage(content, imgPath, needCompress);
//        ImageIO.write(image, FORMAT_NAME, byteArrayOutputStream);
//        //
//        InputStream inputStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());
//        BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
//        BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(output);
//        //
//        int length = 0;
//        byte[] temp = new byte[1024 * 10];
//        while ((length = bufferedInputStream.read(temp)) != -1) {
//            bufferedOutputStream.write(temp, 0, length);
//        }
//        bufferedOutputStream.flush();
//        if (bufferedOutputStream != null) {
//            try {
//                bufferedOutputStream.close();
//            } catch (IOException ioe) {
//                ioe.fillInStackTrace();
//            }
//        }
//        if (bufferedInputStream != null) {
//            try {
//                bufferedInputStream.close();
//            } catch (IOException ioe) {
//                ioe.fillInStackTrace();
//            }
//        }
//        if (inputStream != null) {
//            try {
//                inputStream.close();
//            } catch (IOException ioe) {
//                ioe.fillInStackTrace();
//            }
//        }
//    }

    /**
     * TODO 向二维码图片中插入LOGO图片
     * @param source 二维码图片
     * @param imgPath  LOGO图片地址
     * @param needCompress 是否压缩
     */
    private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
        // 尝试读取本地图片
        File file = new File(imgPath);
        Image src = null;
        if (file.exists()) {
            src = ImageIO.read(new File(imgPath));
        } else {
            src = ImageIO.read(FileUtil.convertFileToInputStream(imgPath));
        }
        if (null == src) {
            return;
        }
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        // 压缩LOGO
        if (needCompress) {
            if (width > WIDTH) {
                width = WIDTH;
            }
            if (height > HEIGHT) {
                height = HEIGHT;
            }
            Image image = src.getScaledInstance(width, height,
                    Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height,
                    BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            // 绘制缩小后的图
            g.drawImage(image, 0, 0, null);
            g.dispose();
            src = image;
        }
        // 插入LOGO
        Graphics2D graph = source.createGraphics();
        int x = (QRCODE_SIZE - width) / 2;
        int y = (QRCODE_SIZE - height) / 2;
        graph.drawImage(src, x, y, width, height, null);
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }

    /**
     * TODO 创建二维码图片文件
     * @param content url地址
     * @param logoPath LOGO地址
     * @param needCompress 是否压缩LOGO
     */
    private static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws Exception {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        if (logoPath == null || "".equals(logoPath)) {
            return image;
        }
        // 插入logo图片
        QrCodeUtil.insertImage(image, logoPath, needCompress);
        return image;
    }

    /**
     * TODO 生成二维码(内嵌LOGO)
     * @param content url地址  
     * @param logoPath LOGO地址
     * @param output 输出流  
     * @param needCompress 是否压缩LOGO
     */
    public static void encode(String content, String logoPath, OutputStream output, boolean needCompress) throws Exception {
        BufferedImage image = QrCodeUtil.createImage(content, logoPath, needCompress);
        ImageIO.write(image, FORMAT_NAME, output);
    }

//    /**
//     * 生成二维码
//     * @param content url地址
//     * @param output 输出流
//     */
//    public static void encode(String content, OutputStream output) throws Exception {
//        QrCodeUtil.encode(content, null, output, false);
//    }

//    /**
//     * 生成二维码
//     * @param content url地址
//     * @param destPath 二维码存储地址
//     * @param needCompress 是否压缩LOGO
//     */
//    public static void encode(String content, String destPath, boolean needCompress) throws Exception {
//        QrCodeUtil.encode(content, null, destPath, needCompress);
//    }

//    /**
//     * 生成二维码
//     * @param content url地址
//     * @param destPath 二维码存储地址
//     */
//    public static void encode(String content, String destPath) throws Exception {
//        QrCodeUtil.encode(content, null, destPath, false);
//    }
    
//    /**
//     * 生成二维码(内嵌LOGO)
//     * @param content url地址
//     * @param imgPath LOGO地址
//     * @param destPath 二维码存储地址
//     * @param needCompress 是否压缩LOGO
//     */
//    public static String encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
//        BufferedImage image = QrCodeUtil.createImage(content, imgPath, needCompress);
//        mkdirs(destPath);
//        String file = new Random().nextInt(99999999)+".jpg";
//        ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
//        return file;
//    }

//    /**
//     * 生成二维码(内嵌LOGO)
//     *
//     * @param content url地址
//     * @param imgPath LOGO地址
//     * @param destPath 二维码存储地址
//     */
//    public static void encode(String content, String imgPath, String destPath) throws Exception {
//        QrCodeUtil.encode(content, imgPath, destPath, false);
//    }

//    /**
//     * 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
//     * @date 2013-12-11 上午10:16:36
//     * @param destPath 存放目录
//     */
//    public static void mkdirs(String destPath) {
//        File file =new File(destPath);
//        //当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
//        if (!file.exists() && !file.isDirectory()) {
//            file.mkdirs();
//        }
//    }
    
//    /**
//     * 解析二维码
//     * @param file 维码图片
//     * @return
//     * @throws Exception
//     */
//    public static String decode(File file) throws Exception {
//        BufferedImage image;
//        image = ImageIO.read(file);
//        if (image == null) {
//            return null;
//        }
//        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
//        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
//        Result result;
//        Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
//        hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
//        result = new MultiFormatReader().decode(bitmap, hints);
//        String resultStr = result.getText();
//        return resultStr;
//    }

//    /**
//     * 解析二维码
//     * @param path 二维码图片地址
//     * @return
//     * @throws Exception
//     */
//    public static String decode(String path) throws Exception {
//        return QrCodeUtil.decode(new File(path));
//    }

}
